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1. CN101292174 - Pmt gain and energy calibrations using lutetium background radiation

Office
China
Application Number 200680038455.6
Application Date 15.09.2006
Publication Number 101292174
Publication Date 22.10.2008
Publication Kind A
IPC
G01T 1/29
GPHYSICS
01MEASURING; TESTING
TMEASUREMENT OF NUCLEAR OR X-RADIATION
1Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
29Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
G01T 1/202
GPHYSICS
01MEASURING; TESTING
TMEASUREMENT OF NUCLEAR OR X-RADIATION
1Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
16Measuring radiation intensity
20with scintillation detectors
202the detector being a crystal
G01T 1/164
GPHYSICS
01MEASURING; TESTING
TMEASUREMENT OF NUCLEAR OR X-RADIATION
1Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
16Measuring radiation intensity
161Applications in the field of nuclear medicine, e.g. in vivo counting
164Scintigraphy
CPC
G01T 1/2985
GPHYSICS
01MEASURING; TESTING
TMEASUREMENT OF NUCLEAR OR X-RADIATION
1Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
29Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
2914Measurement of spatial distribution of radiation
2985In depth localisation, e.g. using positron emitters; Tomographic imaging (longitudinal and transverse section imaging; apparatus for radiation diagnosis sequentially in different planes, steroscopic radiation diagnosis);
A61B 6/037
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
6Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
02Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
03Computerised tomographs
037Emission tomography
G01T 1/1644
GPHYSICS
01MEASURING; TESTING
TMEASUREMENT OF NUCLEAR OR X-RADIATION
1Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
16Measuring radiation intensity
161Applications in the field of nuclear medicine, e.g. in vivo counting
164Scintigraphy
1641Static instruments for imaging the distribution of radioactivity in one or two dimensions using one or several scintillating elements; Radio-isotope cameras
1644using an array of optically separate scintillation elements permitting direct location of scintillations
G01T 1/202
GPHYSICS
01MEASURING; TESTING
TMEASUREMENT OF NUCLEAR OR X-RADIATION
1Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
16Measuring radiation intensity
20with scintillation detectors
202the detector being a crystal
Applicants Koninklijke Philips Electronics N.V.
皇家飞利浦电子股份有限公司
Inventors Cooke Steven
S·库克
Laurence Thomas
T·劳伦斯
Agents huangrui wangyang
永新专利商标代理有限公司
永新专利商标代理有限公司
Priority Data 60/728,433 17.10.2005 US
Title
(EN) Pmt gain and energy calibrations using lutetium background radiation
(ZH) 使用镥本底辐射的PMT增益和能量校准
Abstract
(EN)
A scintillator (18) includes radioactive elements which emit radiation of a characteristic energy, such as lutetium<176>, which emits 202 keV and 307 keV gamma-rays. The scintillators have light output levels that vary and photomultiplier tubes that respond to the light scintillations tend to drift. When a scanner (10) is not generating diagnostic images, the photomultiplier tubes detect scintillations from the lutetium176 radiation. A self- calibration processor (40) adjusts the gain for each photomultiplier tube such that its output peak corresponds to 202 keV or 307 keV and adjusts a scaling factor for PMT outputs corresponding to each scintillator such that the output peaks have a common amplitude.

(ZH)

闪烁器(18)包括发射特征能量辐射的放射性元素,例如镥176,其发射202keV和307keV的γ射线。闪烁器具有变动的光输出水平,和对倾向于漂移的光闪烁有响应的光电倍增管。当扫描器(10)不生成诊断图像时,光电倍增管探测来自镥176辐射的闪烁。自校准处理器(40)调节每个光电倍增管的增益,使得其的输出峰对应于202keV或307keV,并调节PMT对应于每个闪烁器的输出的缩放因子,使得输出峰具有共同幅度。